WO2005065484A1

WO2005065484A1 - Braking device for worktables

Info

Publication number: WO2005065484A1
Application number: PCT/EP2004/011993
Authority: WO
Inventors: Hans Looser
Original assignee: moll Funktionsmöbel GmbH
Priority date: 2003-12-24
Filing date: 2004-10-23
Publication date: 2005-07-21
Also published as: CN100558273C; JP2007518474A; CN1897847A; EP1696764A1; DE10360721A1

Abstract

The invention relates to a braking device (14A) for worktables (1), comprising a work platform (2) that can be inclined about a horizontal articulation axis (3) and a supporting strut (8) for supporting the work platform (2) in the respective inclined position. The supporting strut (8) is guided by a guide device that can be fixed to the body (5) of the installation and the braking device (14A) brakes the supporting strut (8) as the work platform (2) is displaced downwards. The braking device (14A) has a chock assembly (30), which is displaceably mounted in relation to a counter-stop (31), along which the supporting strut (8) slides as it is displaced upwards and downwards. The chock assembly (30) moves with the supporting strut (8) as the latter is displaced upwards, into a release position, essentially releasing the supporting strut (8) from the chock assembly (30) and the braking action of the braking device is suspended completely or to a great extent. When the supporting strut (8) is displaced downwards, the chock assembly (30) is clamped in a braking position between the counter-stop (31) and the supporting strut (8) in such a way that the latter (8) slides along the chock assembly (30) with a degree of friction and is braked by said assembly (30).

Description

Braking device for work tables

description

The invention relates to a braking device for work tables with a worktop which can be tilted about a horizontal articulation axis and a support rod for supporting the worktop in the respective inclined position, the support rod being guided by a guide device to be fastened to the furniture body and the braking device supporting the support rod when the worktop is moved downwards slows.

Such a braking device for work tables can be seen, for example, from German patent application 102 29 617.0. In the known brake device, brake shoes or brake bodies engage the support rod when the worktop is adjusted downwards. Otherwise you would have to hold the worktop when moving it downwards so that it does not cause damage or even injuries in some table constructions, for example if a user's hand gets between the worktop and the furniture body and is injured.

The known braking device is actuated by an actuating element which is used at the same time to unlock an inclined adjusting device. When the tilting device is unlocked, the worktop can be adjusted downwards. At the same time, the known braking device comes into action and brakes the support rod or the worktop. However, it is necessary for the actuating element to actuate both the braking device and the locking device at the same time. However, locking devices are also conceivable in which such a simultaneous Operation of the braking device and the locking device is not possible or only possible with considerable effort.

It is therefore the object of the present invention to further develop a braking device of the type mentioned at the outset so that the braking effect is activated automatically, that is to say without an additional actuation action.

This object is achieved by a braking device of the type mentioned at the outset, which has a brake wedge arrangement which is mounted movably with respect to a counter-holder and to which the support rod slides in the longitudinal direction during its upward movement or downward movement, the support rod the slide wedge arrangement during the upward movement in such a way takes into a release division that the support rod is essentially free of the brake wedge arrangement and the braking effect of the braking device is completely or substantially canceled, and the brake wedge arrangement is clamped between the counter-holder and the support rod in a braking position during the downward movement of the support rod, so that the Support rod in the brake wedge assembly slides along frictionally and is braked by the brake wedge assembly.

The braking device according to the invention automatically comes into action when the worktop is lowered, the brake wedge arrangement being clamped between the counter-holder and the support rod. However, wedging does not occur in which the support rod would no longer be movable. Rather, the support rod slides past the brake wedge arrangement, which consists for example of an elastic plastic, a rubber-like material or the like. By selecting a suitable material for the brake wedge arrangement and / or the support rod, the friction properties between the brake wedge arrangement and the support rod can be influenced. These friction properties are expediently set in such a way that the support rod is not jammed but braked. Other parameters with which the braking Kung the brake wedge assembly and / or jamming can be avoided, for example, the geometry of the brake wedge assembly, a distance between the counter-holder and the support rod, one or more stops against which the brake wedge assembly strikes when it is moved to the braking position, or the like.

Various designs of a braking device according to the invention are presented below.

For example, the brake wedge arrangement is provided on the front side with a sliding plane which rests on the support part, in particular lies flat. The sliding plane runs essentially parallel to the support rod. On the back of the brake wedge arrangement there is an inclined surface which bears on the counter-holder, in particular in the braking position. Such a brake wedge arrangement can be designed, for example, as a type of brake block.

The braking effect of such a brake wedge arrangement can be influenced, for example, by a longitudinal stop against which the brake wedge arrangement strikes during a longitudinal displacement in the direction of the braking position. The longitudinal stop is preferably adjustable, for example in the form of a screw present in a housing of the braking device.

However, an upper and / or a lower stop are expediently also present on the brake wedge arrangement. The lower stop prevents the brake wedge arrangement from being carried too far, so to speak, in the direction of the release division in the longitudinal direction by the support rod. The upper stop is assigned to the braking position and prevents, for example, jamming of the support rod with the brake wedge arrangement. The lower and the upper stop preferably strike against a single stationary counter stop (there may also be two or more counter stops). The counter-stop is advantageously formed by the counter-holder. A further adjustment option for adjusting the braking effect is expediently provided by a transverse adjustment device. This transverse adjustment device acts transversely to the support rod against the brake wedge arrangement. The transverse adjustment device can, for example, adjust the distance between the counter holder and the support rod. However, it is also possible for the transverse adjustment device to act directly on the brake wedge arrangement. The transverse adjustment device, which contains, for example, a screw, then presses the brake wedge arrangement against the support rod, so to speak.

A further possibility of influencing the adjustment of the braking effect is provided by an inclination adjustment device which serves to adjust the inclination of the inclined surface on the brake wedge arrangement. The inclination adjustment device contains, for example, a spreading means, for example a wedge, a screw or the like, which penetrates to different extents in the brake wedge arrangement and thus causes a spreading force of different strength.

Another design of a brake device according to the invention provides that the brake wedge arrangement is designed as an eccentric pivotally mounted on the counter holder with an eccentric surface. When pivoting in the release division, a smaller distance between the counterholder and the eccentric surface is pivoted in the direction of the support rod, so that it can be moved essentially freely past the eccentric. In the opposite direction, the support rod takes the eccentric and swivels it into the braking position. Then there is a greater distance between the counterholder and the eccentric surface, so that the support rod slides along the surface of the eccentric under a contact pressure and is braked by the eccentric.

A pivot stop is expediently present on the eccentric, which stops when pivoting against a counter-pivot stop, for example on the housing of the braking device. A further pivoting of the eccentric is thus limited up to a greater distance between the counter-holder and the eccentric surface, so that the contact pressure of the eccentric against the support rod is limited. The pivot stop, for example, projects radially in front of the eccentric. The counter pivot stop is expediently adjustable and is formed, for example, by a screw.

The braking device according to the invention advantageously serves as a guide device for guiding the support rod. It is also possible that it has a locking device for locking the support rod, for example a clamping element, a locking bolt which engages in openings on the support rod, or the like. Such a braking device could also be referred to as a support device in which both the function of braking and the functions of supporting and locking the support rod are present.

Exemplary embodiments of the invention are explained in more detail below with reference to the drawing. Show it:

FIG. 1 shows a work table with a braking device according to the invention, which forms part of a tilting device and with a cross-section that can be tilted and is supported by a support rod,

FIG. 2A shows a perspective view, partly in section along line II-II in FIG. 2B, of a first exemplary embodiment of a braking device according to the invention for the work table according to FIG. 1 with a block-type brake wedge arrangement which, in the braking position, strikes against an adjustable longitudinal stop,

FIG. 2B the braking device according to FIG. 2A from above, FIG. 2C shows the braking device according to FIG. 2A in cross section (along a line II-II in FIG. 2B), the brake wedge arrangement being displaced into a release division in which the support rod is essentially freely movable,

FIG. 2D shows the braking device approximately according to FIG. 2C, the brake wedge arrangement, however, being displaced into a braking position braking the support rod,

FIG. 3A shows a perspective view, partly in section along a line III-III in FIG. 3B, of a second exemplary embodiment of a braking device according to the invention for the work table according to FIG. 1 with a block-type brake wedge arrangement which strikes against an adjustable longitudinal stop in the braking position, and with one transverse to the support rod adjustable counterholder,

FIG. 3B the braking device according to FIG. 3A from above,

FIG. 3C shows the braking device according to FIG. 3A in cross section (along a line III-III in FIG. 3B), a housing of the braking device being shown only partially and the brake wedge arrangement being displaced into a release division in which the support rod is essentially freely movable,

FIG. 3D the braking device approximately according to FIG. 3C, the brake wedge arrangement, however, being shifted into a braking position braking the support rod or on the way to the braking position,

FIG. 4A shows a perspective view of a third exemplary embodiment of a braking device according to the invention for the work table according to FIG. 1, partly cut along a line IV-IV in FIG. 4B, the partial of the braking device according to FIGS 3A-3D corresponds, but with an inclination adjustment device for the brake wedge arrangement in the form of an expansion means spreading the brake wedge arrangement,

4B-4D the braking device according to FIG. 4A in views which correspond approximately to the views according to FIGS. 3B - 3D,

FIG. 5A shows a perspective view, partly in section along a line V-V in FIG. 5B, of a fourth exemplary embodiment of a braking device according to the invention for the work table according to FIG. 1 with an eccentric brake wedge arrangement,

FIG. 5B the braking device according to FIG. 5A from above,

5C shows the braking device according to FIG. 5A in cross section (along a line V-V in FIG. 5B), the eccentric brake wedge arrangement being pivoted into a release position in which the support rod is essentially freely movable,

5D shows the braking device approximately according to FIG. 5C, the eccentric brake wedge arrangement, however, being pivoted into a braking position braking the support rod.

In the case of a work table 1 shown schematically in FIG. 1, for example a desk intended for children or adolescents, a table top or work surface 2 can be inclined from a horizontal, dash-dotted starting position into one or more inclined positions, in which it is seen by the user towards the rear upwards increases. In Figure 1, such an inclined position of the worktop 2 is drawn with solid lines. The worktop 2 is in the region of its front facing the user about an articulation axis 3 running on the table body 5 in the horizontal direction in the longitudinal direction of the table swiveling and thus inclinable. Further to the rear, on the underside of the worktop 2, an inclination device 4 acts, which holds the worktop 2 in the respective inclined position. In its horizontal starting position, the worktop 2 can rest on a stop 6 arranged on the table body 5.

The worktop 2 is supported by a support rod 8 which is guided through the inclination device 4. A housing 16 of the inclination device 4 is designed as a guide device 18 in that the support rod 8 penetrates openings (not shown) on the top and bottom of the housing 16, the support rod 8 passing through the openings e.g. is led. When the worktop 2 is pivoted, the support rod 8 passes through the inclination device 4 in the longitudinal direction 15 upwards or downwards. With its lower area, the support rod 8 dips into a telescopic receptacle 7, which can also serve to guide the support rod 8. Overall, a telescope arrangement is then formed. A lower end 9 of the telescopic receptacle 7 is fastened to the table body 5, for example.

A support rod end 10 of the support part 8 supporting the worktop 2 is assigned a slide element 12, which is fastened to the worktop 2 and is indicated only schematically, on which the support rod 8 is displaceably and pivotably mounted in the depth direction 13 of the worktop 2, that is to say at right angles to the articulation axis 3.

The tilting device 4 contains a schematically illustrated locking device 11 for locking the support rod 8 and a braking device 14. The locking device 11 serves to lock the support rod 8 so that the worktop 2 is held in different inclined positions. The locking device 11 can be released by means of an actuating device 17, so that the worktop 2 can be pivoted downward and the support rod 8 passes through the inclination device 4 in the downward direction.

The actuating device 17 has an actuating rod 20 which can be gripped by the user. In the exemplary embodiment, this actuating rod 20 extends from the area of the braking device 14 below the worktop 2 to the front of the worktable 2 facing the user. The actuating rod 20 is expediently guided in a linear direction, that is to say in its longitudinal direction, so that the user must move it in the longitudinal direction. When the user pulls the actuating rod 20 towards the front of the work table 10, the locking device 11 is released so that the worktop 2 can be pivoted downward. If the user releases the actuating rod 20 again, the locking device 11 locks automatically, for example under the action of a spring device, so that the downward movement of the worktop 2 is stopped.

During the downward movement of the worktop 2, the braking device 14 brakes the support rod 8, so that the downward movement of the worktop 2 is braked. Accordingly, the worktop 2 does not have to be gripped by the user during the downward movement in order to prevent an unimpeded impact on the stop 6. The braking device 14, which has a brake wedge arrangement 21, automatically comes into action when the support rod 8 moves downward and brakes the support rod 8. During the upward movement, the braking device 14 releases the support rod automatically, so to speak, so that the worktop 2 is unaffected by the braking device 14 can be pivoted upwards.

Various designs are proposed for the braking device 14, which are explained in more detail below in connection with FIGS. 2A to 5D. The braking devices explained in these figures are designated in the following with the reference numerals 14A to 14D and can be used instead of the matically illustrated braking device 14 are used in the inclination device 4.

2A to 2D show a first exemplary embodiment of a brake device 14A according to the invention with a block-type brake wedge 30 as a brake wedge arrangement 21, which is mounted in a longitudinally movable manner in the longitudinal direction 15 between a counter-holder 31 and the support rod 8, which is shown only in a shortened manner.

The support rod 8 penetrates a housing 32 of the brake device 14A at an upper and a lower opening 33, 34 and is guided by the housing 32, the openings 33, 34 forming guide devices 47, for example. In the present case, the support rod 8 has a rectangular cross section, which correlates with rectangular cross sections of the openings 33, 34. Thus, the support rod 8 is guided non-rotatably by the housing 32.

The brake wedge 30 lies on the support rod 8 with its essentially flat front side 35. The support rod 8 can slide along the front side 35, so that the front side 35 forms a sliding plane. The rear side 36 opposite the front side 35, on the other hand, is chamfered and thus forms an inclined surface 37. The counter holder 31 is, for example, a mandrel or support rod, which is preferably fixed to the housing 32 transversely to the support rod 8.

During its upward movement, the support rod 8 takes the brake wedge 30 upwards, so that it arrives in a release division, which is shown in FIG. 2C. In the release division, the support rod 8 essentially comes free from the brake wedge 30 and can thus be shifted upwards without being braked or at least essentially without brakes. The inclination of the inclined surface 37 is such that the brake wedge 30 tapers downwards. In the release division there is a narrower cross-section, expediently the narrowest area between the front 35 and rear 36 of the brake wedge 30 between the counter-holder 31 and the support rod 8, so that the brake wedge 30 presses against the support rod 8 with little contact pressure, or preferably even with a small one Game between the counter holder 31 and the support rod 8 is arranged. In any case, the braking effect of the brake wedge 30 is minimal or no longer present in the release division.

An upper and a lower projection 38, 39 protrude in front of the inclined surface 37. The projections 38, 39 form upper and lower stops 40, 41. In the release position, the lower stop 41 abuts against a stationary counter-stop 42, which in the exemplary embodiment is formed by the counter-holder 31. The lower stop 41 and the counter stop 42 limit the adjustment path of the brake wedge 30, so that the brake wedge 30 remains in the area between the counter holder 31 and the support rod 8.

The counter holder 31 forms guide means 19 on which the brake wedge 30 is guided so as to be longitudinally displaceable. It goes without saying that further guide means can be present, for example guide grooves on the side of the housing 32, on which the brake wedge 30 is guided.

If the support rod 8 moves downward, it takes the brake wedge 30 with it. In addition, the brake wedge 30 can also be shifted downward due to its gravity. In any case, during the downward movement of the support rod 8, the brake wedge 30 reaches its braking position, in which it is clamped between the counter-holder 31 and the support rod 8, so that the support rod 8 slides and brakes along the front sliding plane 35 of the brake wedge 30 in a frictionally locking manner. In the braking position there is a wider distance between the front side 35 compared to the release position and rear side 36 between the counter holder 31 and the support rod 8.

The downward movement of the brake wedge 30 is limited by a lower longitudinal stop 43. The longitudinal stop 43 is presently adjustable in the longitudinal direction 15 and is formed, for example, by an adjusting screw 44 penetrating the housing 32 from below. The screw 44 is screwed into the housing 32, for example, and can be adjusted between different longitudinal positions. The underside of the brake wedge 30 abuts against the longitudinal stop 43, so that a further shifting of the brake wedge 30 downward is stopped (FIGS. 2A, 2D).

By adjusting the screw 44, the contact pressure with which the brake wedge 30 rests on the support rod 8 can be varied. The contact pressure is greater, for example, when the longitudinal stop 43 is adjusted downward, so that due to the inclination of the inclined surface 37, a section of the brake wedge 30 comes to lie between the counter-holder 31 and the support rod 8, which has a greater distance between the inclined surface 37 and Front 35 has. If the screw 44 is screwed further into the housing 32 and the longitudinal stop 43 is thus moved upward, a section of the brake wedge 30 comes to lie between the counter-holder 31 and the support rod 8, in which the distance between the front and rear 35, 36 of the Brake wedge 30 is smaller. Accordingly, in the braking position, the contact pressure with which the brake wedge 30 rests on the support rod 8, and thus the braking effect of the braking device 14A, is smaller.

If the longitudinal stop 43 is missing or, for example, the screw 44 is completely unscrewed, the upper projection 38 or the upper stop 40 of the brake wedge 30 comes into play. When the support rod 8 moves downward, the brake wedge 30 is then shifted downwards until the upper stop 40 contacts the counter-holder 31, that is to say the counter-stop 42. suggests. Then the braking effect of the brake wedge 30 is at a maximum.

A situation is also conceivable in which the frictional relationships between the brake wedge 30 and the support rod 8 are set such that a stable equilibrium is created, so to speak. Even in the absence of a longitudinal stop 43, the brake wedge 30 could, for example, assume the longitudinal position shown in FIG. 2D, which e.g. would roughly correspond to the situation according to FIG. 3D. The forces acting downward during a downward movement of the support rod 8, e.g. Driving forces and weight forces could then not be sufficient to shift the brake wedge 30 downwards until, for example, the upper stop 40 abuts against the counter stop 42.

A braking device 14B shown in FIGS. 3A to 3D partially has the same or similar components as the braking device 14A, which are not explained in more detail below and accordingly have the same reference numerals.

In contrast to the braking device 14A, the braking device 14B has a fixed lower longitudinal stop 50, for example in the form of an upwardly projecting housing projection 51 arranged in the interior of the housing 32. Like the longitudinal stop 43, the longitudinal stop 50 also limits the displacement path of the brake wedge 30 downwards when the support rod 8 is shifted downwards. It goes without saying that the function of the lower longitudinal stop 50 can also be fulfilled by the upper stop 40 of the brake wedge 30 or the counter stop 42.

The distance between the counter holder 31 and the support rod 8 can be influenced with a transverse adjusting device 52. The transverse adjusting device 52 contains, for example, a screw 53 screwed into the side of the housing 32, which acts on the counter-holder 31 transversely to the support rod 8. When screwing the screw 53 into the housing 32, that is at a displacement of the transverse adjusting device 52 closer to the support rod 8, the distance between the counter-holder 31 and the support rod 8 becomes smaller. The counter-holder 31 is, for example, under a predetermined prestress, so that the distance between the counter-holder 31 and the support rod 8 becomes larger when the transverse adjusting device 52 is moved away from the support rod 8.

The transverse adjustment device 52 is particularly effective when the brake wedge 30 strikes against the lower longitudinal stop 50 or the upper projection 38 or stop 39 against the counter-holder 31 or counter-stop 42. Then the reduced distance between the counter-holder 31 and the support rod 8 has an effect, the contact pressure with which the brake wedge 30 bears on the support rod 8 being different depending on the transverse position of the transverse adjusting device 52.

A braking device 14C shown in FIGS. 4A to 4D is constructed similarly to the previously described braking device 14B. Correspondingly, the same or similar components are identified in the same way as in the previous figures and bear the same reference symbols.

Between the counter-holder 31 and the support rod 8, a brake wedge 55 is mounted in the brake device 14C as a brake wedge arrangement 21 in a longitudinally movable manner and has a tilt adjustment device 56 for adjusting the tilt of its rear inclined surface 57 facing the counter-holder 31. The inclination adjustment device 56 contains a recess 58 oriented in the longitudinal direction 15, for example in the form of a slot, a bore or the like. A spreading body 59, which forms a spreading means, penetrates into the longitudinal recess 58 from above. In the exemplary embodiment, the expansion body 59 is a grub screw, which is screwed into the recess 58 and, depending on its depth of penetration into the recess 58, spreads the brake wedge 55, so that the angle of inclination of the rear inclined surface 57 pulled on the front 35 of the brake wedge 55 is adjustable. The braking action of the braking device 14C can thus be adjusted with the aid of the inclination adjusting device 56.

In addition, the braking effect can be influenced by the transverse adjustment device 52. It goes without saying that the transverse adjustment device 52 in the braking device 14C is merely an optional variant, which can also be omitted. Furthermore, the braking device 14C could have an adjustable longitudinal stop, for example in the manner of the adjustable longitudinal stop 43 in the braking device 14A.

5A to 5D, a braking device 14D is shown which, instead of a block-like, longitudinally displaceable brake wedge, has a brake wedge arrangement 21 in an eccentric form, for example in the form of an eccentric. A surface 62 of the eccentric 60 extends at least in sections eccentrically about a pivot axis 61, on which the eccentric 60 is pivotally mounted.

In the exemplary embodiment, the counter-holder 31, which is present in the form of a rod, forms the pivot axis 61, about which the eccentric 60 can be pivoted between a release division (see FIG. 5C) and a braking position (see FIG. 5D). In the release position, the support rod 8 can be moved essentially freely along the eccentric 60, in the braking position, however, the support rod 8 slides along the surface 62 of the eccentric 60 and is therefore braked. The eccentricity of the surface 62 with respect to the pivot axis 61 is selected such that in the release division the distance 63 between the pivot axis 61 and the surface 62 is smaller in a vertical projection onto the support rod 8 and in the braking position a correspondingly larger distance 64 between the pivot axis 61 and surface 62 in projection onto the support rod 8 is present. A pivot stop 65 projects radially in front of the eccentric 60. In the present case, the pivot stop 65 is oriented downwards. The pivot stop 65 thus contributes to the fact that the eccentric 60 is pivoted into its pivot position shown in FIG. 5D when the support rod 8 is moved downward. In the exemplary embodiment, the support rod 8 takes the eccentric 60 with it when it is moving down and pivots it into the braking position. Thus, the weight of the projection 65 is not absolutely necessary for pivoting into the braking position. It goes without saying that for the automatic pivoting of the eccentric 60 into the braking position, another weight or a corresponding weight distribution could also be provided for the eccentric 60.

During its upward movement, the support rod 8 takes the eccentric 60 with it so far and pivots the eccentric 60 into its release division that the support rod 8 essentially comes free from the eccentric 60 and can be moved upwards without being braked or essentially without brakes.

The swivel stop 65 limits the swivel path of the eccentric 60 from the release division into the braking position by hitting a counter swivel stop 66 which is stationary with respect to the counter holder 31 when swiveling into the braking position. The counter pivot stop 66 is oriented transversely to the support rod 8. When pivoting in the braking position, the pivot stop 65 is pivoted away from the support rod 8 and strikes against the counter-pivot stop 66.

The counter pivot stop 66 is preferably adjustable. In the exemplary embodiment, the counter pivot stop 66 is realized by a screw 67 which penetrates a side wall 68 of a housing 69 of the braking device 14D. The screw 67 is screwed into the side wall 68, for example, so that the transverse position of the counter-pivot stop 66 can be adjusted by turning the screw 67. In the exemplary embodiment, the course of the surface is 62 For example, selected so that when the counter-pivot stop 66 is adjusted closer to the support rod 8, the braking effect of the eccentric 60 is smaller. If the screw 67 is shifted to the left and the counter pivot stop 66 is thus displaced away from the support rod 8, the braking effect of the eccentric 60 increases. With increasing displacement of the counter-swivel stop 66 away from the support rod 8, areas of the surface 62 of the eccentric 60 in the respective braking position come into frictional contact with the support rod 8 and have smaller distances from the swivel axis 61. Accordingly, the pressure with which the eccentric 60 bears on the support rod 8 in the respective braking position is greater.

It goes without saying that a braking device of the type described above can also easily include locking means, for example in the form of jamming elements or bolts engaging in recesses (not shown) on the support rod 8, with which the support rod 8 can be locked in the longitudinal direction 15.

Claims

Expectations

1. Braking device for work tables (1) with a worktop (2) which can be inclined about a horizontal articulation axis (3) and a support rod (8) for supporting the worktop (2) in the respective inclined position, the support rod (8) from one on the furniture body (5) guide device (7, 4) to be fastened and the braking device (14; 14A-14D) brakes the support rod (8) when the work plate (2) moves downwards, characterized in that the braking device (14; 14A- 14D) has a brake wedge arrangement (21, 30; 60) which is movably mounted with respect to a counter-holder (31) and along which the support rod (8) slides in the longitudinal direction during its upward or downward movement, the support rod (8) supporting the Brake wedge arrangement (21, 30; 60) takes in a release position during the upward movement in such a way that the support rod (8) is essentially free of the brake wedge arrangement (21, 30; 60) and the braking effect of the brake device is completely or substantially canceled, and wherein the brake wedge arrangement (21, 30; 60) is clamped in a braking position during the downward movement of the support rod (8) between the counter-holder (31) and the support rod (8), so that the support rod (8) is guided along the brake wedge arrangement (21, 30; 60) in a frictionally locking manner and by the Brake wedge assembly (21, 30; 60) is braked.

2. Braking device according to claim 1, characterized in that the brake wedge arrangement (21, 30) has a sliding plane (35) resting on the supporting part on the front and an inclined surface (37, 57) on the back, which bears on the counter-holder (31).

3. Braking device according to claim 2, characterized in that the brake wedge arrangement (21, 30) has a stop (41) which in the event of a longitudinal displacement of the brake wedge arrangement. tion (21, 30) in the direction of the release division against a stationary counter-stop, in particular against the counter-holder (31).

4. Braking device according to claim 2 or 3, characterized in that the brake wedge arrangement (21, 30, 55) has a stop (40) which in the event of a longitudinal displacement of the brake wedge arrangement (21, 30, 55) in the direction of the braking position against a stationary position Counter stop, in particular against the counter holder (31).

5. Braking device according to one of claims 1 to 4, characterized in that it has a longitudinal stop (43) against which the brake wedge arrangement (21, 30, 55) strikes during a longitudinal displacement in the direction of the braking position.

6. Braking device according to claim 5, characterized in that the longitudinal stop (43) is adjustable for adjusting the braking effect.

7. Braking device according to one of the preceding claims, characterized in that it has a transverse adjusting device (52) acting directly or transversely to the support rod (8) against the brake wedge arrangement (21, 30, 55).

8. Braking device according to claim 7, characterized in that a distance of the counter-holder (31) to the support rod (8) is adjustable with the transverse adjusting device (52).

9. Braking device according to one of claims 1 to 8, characterized in that the brake wedge arrangement (21, 55) has an inclination adjustment device (56) for adjusting the inclination of the inclined surface (57).

10. Braking device according to claim 9, characterized in that the inclination adjustment device (56) contains a spreading means (59) with which the brake wedge arrangement (55) can be spread to adjust an angle between the front and the rear of the brake wedge arrangement (55) is.

11. Braking device according to one of the preceding claims, characterized in that it has guide means (19) for longitudinal guidance of the brake wedge arrangement (30, 55).

12. Braking device according to claim 11, characterized in that the guide means (19) are formed by a housing of the braking device (14; 14A-14D).

13. Braking device according to claim 1, characterized in that the brake wedge arrangement (21, 60) is designed as an eccentric (60) pivotably mounted on the counter-holder (31) with an ex-o-centric surface (62).

14. ^' Braking device according to claim 13, characterized in that on the eccentric (60) there is a swivel stop (65) which, when the eccentric brake wedge arrangement (60) is swiveled in the direction of the braking position, opposes a particularly adjustable counter-swivel stop (66). strikes.

15. Braking device according to one of the preceding claims, characterized in that it has a locking device for locking the support rod (8). 16. Brake device according to one of the preceding claims, characterized in that it forms or contains the guide device (18) for guiding the support rod (8).